|                                                                                                                                                                                         | United      States                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | Securities      and Exchange Commission                                                             |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | Washington,      D.C. 20549                                                                         |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | Form      10-Q                                                                                      |
|                                                                                                                                                                                         |                                                                                                |
| (Mark      One)                                                                                                                                                                              |
|                                                                                                                                                                                         |                                                                                                |
| R                                                                                                                                                                                            | QUARTERLY      REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF      1934  |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | For      the quarterly period ended September 30, 2009                                              |
|                                                                                                                                                                                         |                                                                                                |
| o                                                                                                                                                                                            | TRANSITION      REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF      1934 |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | For      the transition period from _____ to _____                                                  |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | Commission      file number 333-150925-02                                                           |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         | ATLAS      RESOURCES PUBLIC 18-2009 (B) L.P.                                                        |
|                                                                                                                                                                                         | (Name      of small business issuer in its charter)                                                 |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         |                                                                                                |
|                                                                                                                                                                                         |                                                                                                |
| Delaware                                                                                                                                                                                     | 26-3223040                                                                                          |
| (State      or other jurisdiction ofincorporation      or organization)                                                                                                                      | (I.R.S.      EmployerIdentification      No.)                                                       |
|                                                                                                                                                                                         |                                                                                                |
| Westpointe      Corporate Center One                                                                                                                                                         |                                                                                                |
| 1550      Coraopolis Heights Rd. 2nd Floor                                                                                                                                                   |                                                                                                |
| Moon      Township, PA                                                                                                                                                                       | 15108                                                                                               |
| (Address      of principal executive offices)                                                                                                                                                | (zip      code)                                                                                     |
|                                                                                                                                                                                         |                                                                                                |
| Issuer’s      telephone number, including area code: (412)      262-2830                                                                                                               |
|                                                                                                                                                                                         |
| Indicate      by check mark whether the registrant (1) has filed all reports required to      be filed by Section 13 or 15 (d) of the Securities                                             |
| Exchange      Act of 1934 during the preceding 12 months (or for such shorter period      that the registrant was required to file such reports),                                            |
| and      (2) has been subject to such filing requirements for the past 90 days.      Yes R      No o                                                                                    |
|                                                                                                                                                                                         |
| Indicate      by check mark whether the registrant has submitted electronically and      posted on its corporate Web site, if any, every  Interactive                                        |
| Data      File required to be submitted and posted pursuant to Rule 405 of      Regulation S-T (§232.405 of this chapter) during the preceding      12                                  |
| months      (or for such shorter period that the registrant was required to submit and      post such files). Yes o No R                                                                     |
|                                                                                                                                                                                         |
| Indicate      by check mark whether the registrant is a large accelerated filer, an      accelerated filer, a non-accelerated filer or a smaller                                             |
| reporting      company. See the definitions of “large accelerated filer”, “accelerated      filer”, “non-accelerated filer” and “smaller reporting |
| company”      in Rule 12b-2 of the Exchange Act (Check One) Large accelerated filer       ̈ Accelerated      filer  ̈      Non-accelerated filer  ̈                        |
| Smaller      reporting company R                                                                                                                                                             |
|                                                                                                                                                                                         |
| Indicate      by check mark whether the registrant is a shell company (as defined in      Rule 12b-2 of the Exchange Act). Yes o No R                                                        |
|                                                                                                                                                                                         |
| Transitional      Small Business Disclosure Format (check one): Yes o No R                                                                                                                   |

| PART      I.   |   | FINANCIAL      INFORMATION                                                                                         | PAGE   |
|----------------|--------|--------------------------------------------------------------------------------------------------------------------|--------|
|           |   |                                                                                                               |   |
| Item      1:   |   | Financial      Statements                                                                                          |   |
|           |   |                                                                                                               |   |
|           |   | Balance      Sheet as of September 30, 2009                                                                        | 3      |
|           |   |                                                                                                               |   |
|           |   | Statements      of Net Earnings for the period April 16, 2009 through September 30,      2009                      | 4      |
|           |   |                                                                                                               |   |
|           |   | Statement      of Changes in Partners’ Capital for the period April 16, 2009 through      September 30, 2009 | 5      |
|           |   |                                                                                                               |   |
|           |   | Statement      of Cash Flows for the period ended September 30, 2009                                               | 6      |
|           |   |                                                                                                               |   |
|           |   | Notes      to Financial Statements                                                                                 | 7-18   |
|           |   |                                                                                                               |   |
| Item      2:   |   | Management’s      Discussion and Analysis of Financial Condition and Results of      Operations              | 18-22  |
|           |   |                                                                                                               |   |
| Item      4:   |   | Controls      and Procedures                                                                                       | 23     |
|           |   |                                                                                                               |   |
| PART      II.  |   | OTHER      INFORMATION                                                                                             |   |
|           |   |                                                                                                               |   |
| Item      6:   |   | Exhibits                                                                                                           | 23     |
|           |   |                                                                                                               |   |
| SIGNATURES     | 24     |
|           |   |                                                                                                               |   |
| CERTIFICATIONS | 25-28  |

|                                                |   | September      30, |        |
|-----------------------------------------------------|--------|--------------------|-------------|
|                                                |   | 2009               |        |
|                                                |   | (Unaudited)        |        |
| ASSETS                                              |   |               |        |
| Current      assets:                                |   |               |        |
| Cash      and cash equivalents                      |   | $                  | —     |   |
| Accounts      receivable – affiliate          |   |               | 4,598,300   |   |
| Short-term      hedge receivable due from affiliate |   |               | 1,464,000   |   |
| Total      current assets                           |   |               | 6,062,300   |   |
|                                                |   |               |        |   |
| Oil      and gas properties, net                    |   |               | 114,252,100 |   |
| Construction      in progress                       |   |               | 14,202,000  |   |
| Long-term      hedge receivable due from affiliate  |   |               | 1,186,800   |   |
|                                                |   | $                  | 135,703,200 |   |
|                                                |   |               |        |   |
| LIABILITIES      AND PARTNERS’ CAPITAL        |   |               |        |   |
| Current      liabilities:                           |   |               |        |   |
| Accrued      liabilities                            |   | $                  | 22,200      |   |
| Short-term      hedge liability due to affiliate    |   |               | 22,500      |   |
| Total      current liabilities                      |   |               | 44,700      |   |
|                                                |   |               |        |   |
| Asset      retirement obligation                    |   |               | 432,600     |   |
| Long-term      hedge liability due to affiliate     |   |               | 417,200     |   |
|                                                |   |               |        |   |
| Partners’      capital:                       |   |               |        |   |
| Managing      general partner                       |   |               | 8,931,600   |   |
| Investors      partners (12,278 units)              |   |               | 123,666,000 |   |
| Accumulated      other comprehensive income         |   |               | 2,211,100   |   |
| Total      partners' capital                        |   |               | 134,808,700 |   |
|                                                |   | $                  | 135,703,200 |   |

|                                            |   | Three      Months  |      |   | Nine      Months   |   |
|-------------------------------------------------|--------|--------------------|-----------|--------|--------------------|--------|
|                                            |   | Ended              |      |   | Ended              |   |
|                                            |   | September      30, |      |   | September      30, |   |
|                                            |   | 2009               |      |   | 2009               |   |
| REVENUES                                        |   |               |      |   |               |   |
| Natural      gas and oil                        |   | $                  | 5,712,200 |   |               | $      | 5,725,700 |   |
| Total      revenues                             |   |               | 5,712,200 |   |               |   | 5,725,700 |   |
|                                            |   |               |      |   |               |   |   |   |
| COSTS      AND EXPENSES                         |   |               |      |   |               |   |   |   |
| Production                                      |   |               | 1,112,600 |   |               |   | 1,118,500 |   |
| Depletion                                       |   |               | 2,284,800 |   |               |   | 2,290,200 |   |
| Accretion      of asset retirement obligation   |   |               | 6,400     |   |               |   | 6,400 |   |
| General      and administrative                 |   |               | 26,400    |   |               |   | 31,100 |   |
| Total      expenses                             |   |               | 3,430,200 |   |               |   | 3,446,200 |   |
| Net      earnings                               |   | $                  | 2,282,000 |   |               | $      | 2,279,500 |   |
|                                            |   |               |      |   |               |   |   |   |
| Allocation      of net earnings:                |   |               |      |   |               |   |   |   |
| Managing      general partner                   |   | $                  | 1,168,200 |   |               | $      | 1,167,700 |   |
| Investor      partners                          |   | $                  | 1,113,800 |   |               | $      | 1,111,800 |   |
| Net      earnings per investor partnership unit |   | $                  | 91        |   |               | $      | 90 |   |

|                                          |   |     |        |   |     |   |        | Accumulated   |   |   |                    |   |
|-----------------------------------------------|--------|----------|-------------|--------|----------|--------|-------------|---------------|--------|--------|-------------------------|--------|
|                                          |   | Managing |        |   |     |   |        | Other         |   |   |                    |   |
|                                          |   | General  |        |   | Investor |   |        | Comprehensive |   |   |                    |   |
|                                          |   | Partner  |        |   | Partners |   |        | Income        |   |   | Total                   |   |
|                                          |   |     |        |   |     |   |        |          |   |   |                    |   |
| Balance      at April 16, 2009                |   | $        | —     |   |     | $      | —     |          |   | $      | —                 |   |   | $ | — |   |
|                                          |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| Partners’      capital contributions:   |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| Cash                                          |   |     | —     |   |     |   | 122,554,200 |          |   |   | —                 |   |   |   | 122,554,200 |   |
| Syndication      and offering costs           |   |     | 13,915,300  |   |     |   | —     |          |   |   | —                 |   |   |   | 13,915,300 |   |
| Tangible      equipment/leasehold costs       |   |     | 7,763,900   |   |     |   | —     |          |   |   | —                 |   |   |   | 7,763,900 |   |
| Total      contributions                      |   |     | 21,679,200  |   |     |   | 122,554,200 |          |   |   | —                 |   |   |   | 144,233,400 |   |
|                                          |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| Syndication      and offering costs,          |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| immediately      charged to capital           |   |     | (13,915,300 | )      |     |   | —     |          |   |   | —                 |   |   |   | (13,915,300 | ) |
|                                          |   |     | 7,763,900   |   |     |   | 122,554,200 |          |   |   |       — |   |   |   | 130,318,100 |   |
| Participation      in revenues and expenses:  |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| Net      production revenues                  |   |     | 1,382,200   |   |     |   | 3,225,000   |          |   |   | —                 |   |   |   | 4,607,200 |   |
| Depletion                                     |   |     | (203,200    | )      |     |   | (2,087,000  | )             |   |   | —                 |   |   |   | (2,290,200 | ) |
| General      and administrative               |   |     | (9,400      | )      |     |   | (21,700     | )             |   |   | —                 |   |   |   | (31,100 | ) |
| Accretion      of asset retirement obligation |   |     | (1,900      | )      |     |   | (4,500      | )             |   |   | —                 |   |   |   | (6,400 | ) |
| Net      earnings                             |   |     | 1,167,700   |   |     |   | 1,111,800   |          |   |   | —                 |   |   |   | 2,279,500 |   |
|                                          |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| Other      comprehensive income               |   |     | —     |   |     |   | —     |          |   |   | 2,211,100               |   |   |   | 2,211,100 |   |
|                                          |   |     |        |   |     |   |        |          |   |   |                    |   |   |   |   |   |
| Balance      at September 30, 2009            |   | $        | 8,931,600   |   |     | $      | 123,666,000 |          |   | $      | 2,211,100               |   |   | $ | 134,808,700 |   |

| Cash      flows from operating activities:                                                    |   |   |         |
|-----------------------------------------------------------------------------------------------|--------|--------|--------------|
| Net      earnings                                                                             |   | $      | 2,279,500    |   |
| Adjustments      to reconcile net earnings to net cash provided by operating      activities: |   |   |         |   |
| Depletion                                                                                     |   |   | 2,290,200    |   |
| Accretion      of asset retirement obligation                                                 |   |   | 6,400        |   |
| Increase      in accounts receivable-affiliate                                                |   |   | (4,598,300   | ) |
| Increase      in accrued liabilities                                                          |   |   | 22,200       |   |
| Net      cash provided by operating activities                                                |   |   | —      |   |
|                                                                                          |   |   |         |   |
| Cash      flows from investing activities:                                                    |   |   |         |   |
| Oil      and gas well drilling contract paid to MGP                                           |   |   | (122,554,200 | ) |
| Net      cash used in investing activities                                                    |   |   | (122,554,200 | ) |
|                                                                                          |   |   |         |   |
| Cash      flows from financing activities:                                                    |   |   |         |   |
| Partners’      capital contribution                                                     |   |   | 122,554,200  |   |
| Net      cash provided by financing activities                                                |   |   | 122,554,200  |   |
|                                                                                          |   |   |         |   |
| Net      increase in cash and cash equivalents                                                |   |   | —      |   |
| Cash      and cash equivalents at beginning of period                                         |   |   | —      |   |
| Cash      and cash equivalents at end of period                                               |   | $      | —      |   |
|                                                                                          |   |   |         |   |
| Supplemental Schedule      of non-cash investing and financing activities:                    |   |   |         |   |
|                                                                                          |   |   |         |   |
| Assets      contributed by managing general partner:                                          |   |   |         |   |
| Lease      costs                                                                              |   | $      | 1,166,300    |   |
| Tangible      drilling costs                                                                  |   |   | 6,597,600    |   |
| Syndication      and offering costs                                                           |   |   | 13,915,300   |   |
|                                                                                          |   | $      | 21,679,200   |   |
|                                                                                          |   |   |         |   |
| Asset      retirement obligation                                                              |   | $      | 426,200      |   |

|                                                                              |   | September      30, |        |
|-----------------------------------------------------------------------------------|--------|--------------------|-------------|
| Oil      and gas properties consist of the following at the dates      indicated: |   | 2009               |        |
|                                                                              |   |               |        |
| Natural      gas and oil properties:                                              |   |               |        |
| Proved      properties:                                                           |   |               |        |
| Leasehold      interests                                                          |   | $                  | 1,166,400   |   |
| Wells      and related equipment                                                  |   |               | 115,375,900 |   |
|                                                                              |   |               | 116,542,300 |   |
|                                                                              |   |               |        |   |
| Accumulated      depletion                                                        |   |               | (2,290,200  | ) |
|                                                                              |   | $                  | 114,252,100 |   |

| ·   | Introduce      a new definition of oil and gas producing activities. This new definition      allows companies to include in their reserve base volumes from      unconventional resources. Such unconventional resources include bitumen      extracted from oil sands and oil and gas extracted from coal beds and      shale formations. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Report      oil and gas reserves using an unweighted average price using the prior      12-month period, based on the closing prices on the first day of each      month, rather than year-end pricing. This should maximize the      comparability of reserve estimates among companies and mitigate the      distortion of the estimates that arises when using a single pricing      date. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit      companies to disclose their probable and possible reserves on a voluntary      basis. Current rules limit disclosure to only proved    reserves. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Update      and revise reserve definitions to reflect changes in the oil and gas      industry and new technologies. New updated definitions include “by      geographic area” and “reasonablecertainty.” |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit      the use of new technologies to determine proved reserves if those      technologies have been demonstrated empirically to lead to reliable      conclusions about reserves volumes. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Require      additional disclosures regarding the qualifications of the chief technical      person who oversees the Partnership’s overall reserve estimation process.      Additionally, disclosures are required related to internal controls over      reserve estimation, as well as a report addressing the independence and      qualifications of a Partnership’s  reserves preparer or auditor      based on Society of Petroleum Engineers  criteria. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Administrative      costs which are included in general and administrative expenses in the      Partnership’s Statements of Net Earnings are payable at $75 per well per      month. Administrative costs incurred for the three months and period ended      September 30, 2009 were $5,000 and $5,200,  respectively. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Monthly      well supervision fees which are included in production expenses in the      Partnership’s Statements of Net Earnings are payable at $975 per well per      month for Marcellus wells and $1,500 per well per month for New Albany and      Indiana Wells. For all other wells a fee of $392 is charged per well per      month, for operating and maintaining the wells. Well supervision fees      incurred for the three months and period ended September 30, 2009 were      $59,900 and $63,700, respectively. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Transportation      fees which are included in production expenses in the Partnership's      Statements of Net Earnings are generally payable at 13% of the natural gas      sales price. Transportation fees incurred for the three months and period      ended September 30, 2009 were $677,500 and $679,300,      respectively. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Assets      contributed from the MGP which are disclosed on the Partnership’s      Statement of Cash Flows as a non-cash activity for the period ended      September 30, 2009 were $7,763,900. The $7,763,900 of assets contributed      is net of $13,915,300 adjustment for syndication and offering costs to      reflect net costs directly attributable to oil and gas      properties. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                                                         |   |               |      |   | For      the Period |   |
|------------------------------------------------------------------------------|--------|--------------------|-----------|--------|---------------------|--------|
|                                                                         |   | Three      Months  |      |   | April      16, 2009 |   |
|                                                                         |   | Ended              |      |   | Through             |   |
|                                                                         |   | September      30, |      |   | September      30,  |   |
|                                                                         |   | 2009               |      |   | 2009                |   |
|                                                                         |   |               |      |   |                |   |
| Net      earnings                                                            |   | $                  | 2,282,000 |   |                | $      | 2,279,500 |   |
| Other      comprehensive income:                                             |   |               |      |   |                |   |   |   |
| Unrealized      holding gains on hedging contracts                           |   |               | 2,912,200 |   |                |   | 2,912,200 |   |
| Less:      reclassification adjustment for gains realized in net    earnings |   |               | (701,100  | )      |                |   | (701,100 | ) |
| Total      other comprehensive income                                        |   |               | 2,211,100 |   |                |   | 2,211,100 |   |
| Comprehensive      income                                                    |   | $                  | 4,493,100 |   |                | $      | 4,490,600 |   |

|                      |   | Asset      Derivatives |   | Liability      Derivatives |      |
|---------------------------|--------|------------------------|--------|----------------------------|-----------|
|                      |   |                   |   |                       |      |   |   |   |   |
| Derivatives      in       |   |                   |   | Fair      Value            |      |   |   | Fair      Value |   |
| Cash      Flow Hedging    |   | Balance      Sheet     |   | September      30,         |      | Balance      Sheet |   | September      30, |   |
| Relationships             |   | Location               |   | 2009                       |      | Location |   | 2009 |   |
|                      |   |                   |   |                       |      |   |   |   |   |
| Commodity      contracts: |   | Current      assets    |   | $                          | 1,464,000 |   | Current      liabilities |   | $ | (22,500 | ) |
|                      |   | Long-term      assets  |   |                       | 1,186,800 |   | Long-term      liabilities |   |   | (417,200 | ) |
|                      |   |                   |   |                       |      |   |   |   |   |   |   |
| Total      derivatives    |   |                   |   | $                          | 2,650,800 |   |   |   | $ | (439,700 | ) |

|                       |   | Gain                                                             |   |                             |   | Gain                                                                                                                                                     |
|----------------------------|--------|------------------------------------------------------------------|--------|----------------------------------|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------|
|                       |   | Recognized      in OCI                                           |   |                             |   | Recognized      in OCI                                                                                                                                   |
|                       |   | on      Derivative                                               |   | Location      of Gain/(Loss)     |   | on      Derivative                                                                                                                                       |
|                       |   | (Effective      Portion)                                         |   | Reclassified      from           |   | (Effective      Portion)                                                                                                                                 |
|                       |   | Three      Months Ended                                          |   |                             |   | Three      Months Ended                                                                                                                                  |
| Derivatives      in        |   | and      Period Ended                                            |   | Accumulated                      |   | and      Period Ended                                                                                                                                    |
| Cash      Flow             |   | September      30,                                               |   | OCI      into Income             |   | September      30,                                                                                                                                       |
| Hedging      Relationships |   | 2009                                                             |   | (Effective      Portion)         |   | 2009                                                                                                                                                     |
|                       |   |                                                             |   |                             |   |                                                                                                                                                     |
| Commodity      contracts   |   | $         2,912,200 |   | Natural      gas and oil revenue |   | $                        701,100 |

|               |   |             |    |   |                 |   |   |            |   |
|--------------------|--------|------------------|---------|--------|----------------------|--------|--------|-----------------|--------|
| Production         |   |             |    |   | Average              |   |   |            |   |
| Period      Ending |   | Volumes          |    |   | Fixed      Price     |   |   | Fair      Value |   |
| December      31,  |   | (MMbtu)      (1) |    |   | (per      MMbtu) (1) |   |   | Asset      (2)  |   |
|               |   |             |    |   |                 |   |   |            |   |
| 2009               |   |             | 178,800 |   |                 | $      | 8.24   |            |   | $ | 625,800 |   |
| 2010               |   |             | 566,100 |   |                 |   | 7.71   |            |   |   | 851,600 |   |
| 2011               |   |             | 340,500 |   |                 |   | 7.04   |            |   |   | 290,300 |   |
| 2012               |   |             | 491,700 |   |                 |   | 7.22   |            |   |   | 218,600 |   |
| 2013               |   |             | 274,700 |   |                 |   | 7.08   |            |   |   | 25,600 |   |
|               |   |             |    |   |                 |   |   |            |   | $ | 2,011,900 |   |

|               |   |                |   |             |    |   |                 |                 |   |                 |   |
|--------------------|--------|---------------------|--------|------------------|---------|--------|----------------------|----------------------|--------|----------------------|--------|
| Production         |   |                |   |             |    |   | Average              |                 |   | Fair      Value      |   |
| Period      Ending |   | Option              |   | Volumes          |    |   | Floor      & Cap |                 |   | Asset                |   |
| December      31,  |   | Type                |   | (MMbtu)      (1) |    |   | (per      MMbtu) (1) |                 |   | (Liability)      (2) |   |
|               |   |                |   |             |    |   |                 |                 |   |                 |   |
| 2009               |   | Puts      purchased |   |             | 1,100   |   |                 | $                    | 11.00  |                 |   | $ | 6,400 |   |
| 2009               |   | Calls      sold     |   |             | 1,100   |   |                 |                 | 15.35  |                 |   |   | — |   |
| 2010               |   | Puts      purchased |   |             | 60,000  |   |                 |                 | 7.84   |                 |   |   | 107,400 |   |
| 2010               |   | Calls      sold     |   |             | 60,000  |   |                 |                 | 9.01   |                 |   |   | — |   |
| 2011               |   | Puts      purchased |   |             | 159,400 |   |                 |                 | 6.52   |                 |   |   | 103,700 |   |
| 2011               |   | Calls      sold     |   |             | 159,400 |   |                 |                 | 7.67   |                 |   |   | — |   |
| 2012               |   | Puts      purchased |   |             | 60,900  |   |                 |                 | 6.51   |                 |   |   | 400 |   |
| 2012               |   | Calls      sold     |   |             | 60,900  |   |                 |                 | 7.72   |                 |   |   | (6,300 | ) |
| 2013               |   | Puts      purchased |   |             | 75,800  |   |                 |                 | 6.52   |                 |   |   | — |   |
| 2013               |   | Calls      sold     |   |             | 75,800  |   |                 |                 | 7.81   |                 |   |   | (12,400 | ) |
|               |   |                |   |             |    |   |                 |                 |   |                 |   | $ | 199,200 |   |
|               |   |                |   |             |    |   |                 |                 |   |                 |   |   |   |   |
|               |   |                |   |             |    |   |                 | Total      Net Asset |   |                 | $      | 2,211,100 |   |

|                             |   | September      30, 2009 |      |
|----------------------------------|--------|-------------------------|-----------|
|                             |   | Level      2            |      |   | Total |   |
|                             |   |                    |      |   |   |   |
| Commodity-based      derivatives |   | $                       | 2,211,100 |   |   | $ | 2,211,100 |   |
| Total                            |   | $                       | 2,211,100 |   |   | $ | 2,211,100 |   |

|                              |   |               |    |   | For      the Period |   |
|-----------------------------------|--------|--------------------|---------|--------|---------------------|--------|
|                              |   | Three      Months  |    |   | April      16, 2009 |   |
|                              |   | Ended              |    |   | Through             |   |
|                              |   | September      30, |    |   | September      30,  |   |
|                              |   | 2009               |    |   | 2009                |   |
|                              |   | Level      3       |    |   | Total               |   |   | Level      3 |   |   | Total |   |
|                              |   |               |    |   |                |   |   |   |   |   |   |   |
| Asset      retirement obligations |   | $                  | 177,200 |   |                | $      | 177,200 |   |   | $ | 426,200 |   |   | $ | 426,200 |   |
| Total                             |   | $                  | 177,200 |   |                | $      | 177,200 |   |   | $ | 426,200 |   |   | $ | 426,200 |   |

|                                                    |   |               |    |   | For      the Period |   |
|---------------------------------------------------------|--------|--------------------|---------|--------|---------------------|--------|
|                                                    |   | Three      Months  |    |   | April      16, 2009 |   |
|                                                    |   | Ended              |    |   | Through             |   |
|                                                    |   | September      30, |    |   | September      30,  |   |
|                                                    |   | 2009               |    |   | 2009                |   |
|                                                    |   |               |    |   |                |   |
| Asset      retirement obligation at beginning of period |   | $                  | 249,000 |   |                | $      | — |   |
| Liabilities      incurred from drilling wells           |   |               | 177,200 |   |                |   | 426,200 |   |
| Accretion      expense                                  |   |               | 6,400   |   |                |   | 6,400 |   |
| Asset      retirement obligation at end of period       |   | $                  | 432,600 |   |                | $      | 432,600 |   |

| ITEM      2. | MANAGEMENT'S      DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS      (UNAUDITED) |
|--------------|-------------------------------------------------------------------------------------------------------------|

|                                     |   |               |   |   | For      the Period |   |
|------------------------------------------|--------|--------------------|--------|--------|---------------------|--------|
|                                     |   | Three      Months  |   |   | April      16, 2009 |   |
|                                     |   | Ended              |   |   | Through             |   |
|                                     |   | September      30, |   |   | September      30,  |   |
|                                     |   | 2009               |   |   | 2009                |   |
| Production      revenues (in thousands): |   |               |   |   |                |   |
| Gas                                      |   | $                  | 5,711  |   |                | $      | 5,725 |   |
| Oil                                      |   |               | 1      |   |                |   | 1 |   |
| Total                                    |   | $                  | 5,712  |   |                | $      | 5,726 |   |
|                                     |   |               |   |   |                |   |   |   |
| Production      volumes:                 |   |               |   |   |                |   |   |   |
| Gas      (mcf/day) (1)                   |   |               | 10,736 |   |                |   | 8,694 |   |
| Oil      (bbls/day) (1)                  |   |               | 1      |   |                |   | 1 |   |
| Total      (mcfe/day) (1)                |   |               | 10,742 |   |                |   | 8,700 |   |
|                                     |   |               |   |   |                |   |   |   |
| Average      sales prices:               |   |               |   |   |                |   |   |   |
| Gas      (per mcf) (1)                   |   | $                  | 5.78   |   |                | $      | 5.78 |   |
| Oil      (per bbl) (1)                   |   | $                  | 52.77  |   |                | $      | 52.77 |   |
|                                     |   |               |   |   |                |   |   |   |
| Average      production costs:           |   |               |   |   |                |   |   |   |
| As      a percent of revenues            |   |               | 19     | %      |                |   | 20 | % |
| Per      mcfe (1)                        |   | $                  | 1.13   |   |                | $      | 1.13 |   |
|                                     |   |               |   |   |                |   |   |   |
| Depletion      per mcfe                  |   | $                  | 2.31   |   |                | $      | 2.31 |   |

| (1)   | “Mcf”      means thousand cubic feet, “mcfe” means thousand cubic feet equivalent and      “bbls” means barrels. Bbls are converted to mcfe using the ratio of six      mcfs to one bbl. |
|-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Introduce      a new definition of oil and gas producing activities. This new definition      allows companies to include in their reserve base volumes from      unconventional resources. Such unconventional resources include bitumen      extracted from oil sands and oil and gas extracted from coal beds and      shale formations. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Report      oil and gas reserves using an unweighted average price using the prior      12-month period, based on the closing prices on the first day of each      month, rather than year-end pricing. This should maximize the      comparability of reserve estimates among companies and mitigate the      distortion of the estimates that arises when using a single pricing      date. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit      companies to disclose their probable and possible reserves on a voluntary      basis. Current rules limit disclosure to only proved    reserves. |
|--------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Update      and revise reserve definitions to reflect changes in the oil and gas      industry and new technologies. New updated definitions include “by      geographic area” and “reasonablecertainty.” |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Permit      the use of new technologies to determine proved reserves if those      technologies have been demonstrated empirically to lead to reliable      conclusions about reserves volumes. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| ·   | Require      additional disclosures regarding the qualifications of the chief technical      person who oversees the Partnership’s overall reserve estimation process.      Additionally, disclosures are required related to internal controls over      reserve estimation, as well as a report addressing the independence and      qualifications of a Partnership’s reserves preparer or auditor based on      Society of Petroleum Engineerscriteria. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Exhibit      No. |   | Description                                                                                                          |
|------------------|--------|----------------------------------------------------------------------------------------------------------------------|
|             |   |                                                                                                                 |
| 4.0              |   | Amended      and Restated Certificate and Agreement of Limited Partnership for Public      18-2009 (B) L.P. (1)      |
| 10.1             |   | Drilling      and Operating Agreement for Atlas America Public 18-2009 (B) L.P. (1)                                  |
| 31.1             |   | Certification      Pursuant to Rule 13a-14/15(d)-14                                                                  |
| 31.2             |   | Certification      Pursuant to Rule 13a-14/15(d)-14                                                                  |
| 32.1             |   | Certification      Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of      the Sarbanes-Oxley |
|             |   | Act      of 2002                                                                                                     |
| 32.2             |   | Certification      Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of      the Sarbanes-Oxley |
|             |   | Act      of 2002                                                                                                     |

| (1) | Filed      on October 15, 2008 in the Form S-1A Registration Statement dated October      15, 2008, File No. 333-150925-02 |
|-----|----------------------------------------------------------------------------------------------------------------------------|

| Pursuant      to the requirements of the Securities of the Exchange Act of 1934, the      registrant has duly caused this report to be signed on its behalf by the      undersigned, thereunto duly authorized. |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                            |
| Atlas      Resources Public 18-2009 (B) L.P.                                                                                                                                                                    |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   | Atlas      Resources, LLC, Managing General Partner |
|                                                                                                                                                                                                            |   |   |
| Date:  November      16, 2009                                                                                                                                                                         |   | By:/s/ Freddie M.      Kotek |
|                                                                                                                                                                                                            |   | Freddie      M. Kotek, Chairman of the Board of Directors, Chief Executive      Officer |
|                                                                                                                                                                                                            |   | and      President |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
| In      accordance with the Exchange Act, this report has been signed by the      following persons on behalf of the registrant and in the capacities and on      the dates indicated.                          |
|                                                                                                                                                                                                            |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
| Date:  November      16, 2009                                                                                                                                                                         |   | By:/s/ Freddie M.      Kotek |
|                                                                                                                                                                                                            |   | Freddie      M. Kotek, Chairman of the Board of Directors, Chief    Executive |
|                                                                                                                                                                                                            |   | Officer      and President |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
| Date:  November      16, 2009                                                                                                                                                                         |   | By:/s/ Matthew A.      Jones |
|                                                                                                                                                                                                            |   | Matthew      A. Jones, Chief Financial Officer |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
| Date:  November      16, 2009                                                                                                                                                                         |   | By:/s/ Sean P.      McGrath |
|                                                                                                                                                                                                            |   | Sean      P. McGrath, Chief Accounting Officer |
|                                                                                                                                                                                                            |   |   |
|                                                                                                                                                                                                            |   |   |
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